Head-mounted display device



FIG. 1 is a top right front perspective view of a head-mounted display device showing our new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is another top right front perspective view thereof, in which a head attachment means in dot-dash broken lines is provided to illustrate an example environment.

The short dash-dash broken line in the figures represents unclaimed portions of the head-mounted display device and the dot-dash broken line showing of a head attachment means in FIG. 8 is for the purpose of illustrating environmental structure; the broken lines form no part of the claimed design. 

CLAIM The ornamental design for a head-mounted display device, as shown and described. 